コンクリート製品の高温促進養生に関する研究 (第 2 報) : 常圧高温 (約 100℃) 蒸気養生

概要

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This report is an addition to the "STUDY ON LOW PRESSURE STEAM CURING METHOD OF CONCRETEP RODUCTS (Part 1)". As previously described, green concrete is cured by high temperature steaming at about 100℃. The behaviour (tensile strength, bond strength and drying shrinkage) of thus cured concrete is proved by experiments as follows : 1) The tensile strength of the high temperature cured concrete (ordinary PC, ω/c : 55%) was 19〜22kg/(cm)^2 and the effect of steam curing period and age was hardly noticed. F_t/F_c value was below 0.1, slightly lower than the concrete cured at normal temperatures. 2) The bond strength of the concrete cured at high temperatures with reinforcing bar showed almost same values regardless of the directions of reinforcing bar (horizontal or vertical). The lowering of bond strength of horizontal reinforcing bar usual with the concrete cured at normal temperatures was scarcely observed. 3) The drying shrinkage of the concrete cured at high temperatures (ω/c : 65%, 3 hours' curing) was approximately 3×(10)^<-4> at the age of 60 days. The shrinkage deformation was reduced to almost half compared with the same of the concrete cured at normal temperatures.
1966-02-28